"We'll be bringing 'Sing Off' back," Telegdy said. "We don't know when. But we believe we've found a little gem, one we can buff up and make better."

"Sing-Off" scored steady, solid ratings during its mid-December run, averaging around a 2.5 in the adults 18-49 most nights. NBC aired eight hours of competition over four nights, a cost-effective way of determining audience interest in the concept.